US20080264702A1 - Power wheelchair - Google Patents
Power wheelchair Download PDFInfo
- Publication number
- US20080264702A1 US20080264702A1 US11/739,809 US73980907A US2008264702A1 US 20080264702 A1 US20080264702 A1 US 20080264702A1 US 73980907 A US73980907 A US 73980907A US 2008264702 A1 US2008264702 A1 US 2008264702A1
- Authority
- US
- United States
- Prior art keywords
- frame
- front wheel
- connection portion
- wheel
- mount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/04—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven
- A61G5/041—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven having a specific drive-type
- A61G5/043—Mid wheel drive
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/06—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S180/00—Motor vehicles
- Y10S180/907—Motorized wheelchairs
Definitions
- the present invention relates generally to a wheelchair, and more particularly to a power wheel, which may drive on a rough road.
- a conventional power wheelchair has a frame, on which two front wheels, two driving wheels and two rear wheels are provided on a front, middle and rear thereof respectively.
- the frame also is provided with two front wheel mounts and two driving wheel mounts on left and right sides to pivot the front wheels and the driving wheels thereon respectively.
- the front wheel mounts and the driving wheel mounts are rigid bodies and made in an integral with the frame, so that the wheelchair is hard to drive on a rough road.
- the front wheel mounts and the driving wheel mounts may be moved relatively to the frame independently and the coupling assemblies provide connections between the front wheel mounts and the driving wheel mounts to make the front wheels and the driving wheels keep in touch on the ground to stabilize the wheelchair.
- the coupling assemblies provide connections between the front wheel mounts and the driving wheel mounts to make the front wheels and the driving wheels keep in touch on the ground to stabilize the wheelchair.
- the coupling assemblies which connect the front wheel mounts and the driving wheel mounts to keep them in touch on the ground, usually are very complex.
- the coupling assembly is a multi-linkage mechanism including a plurality of links with various lengths. This kind of multi-linkage mechanism is hard to design and assemble and has a high cost.
- the cushion devices are adjacent to a seat of the wheelchair that vibration transmits to the seat through the cushion devices. As a result, the user is not comfortable to sit on the wheelchair and the cushion capacity of the wheelchair is limited also.
- the primary objective of the present invention is to provide a power wheelchair, which provides the front wheel mount and the middle wheel mount pivoted on the same position of the frame to replace the conventional structure, which the front wheel mount, and driving wheel mount and the frame are a rigid body. Furthermore, the power wheelchair of the present invention provides an elastic device between the front wheel mount and the middle wheel mount for vibration absorption.
- the power wheelchair of the present invention has advantages of simple structure, easy to design and manufacture, lower manufacture cost, easy to repair, and longer durability.
- a power wheelchair includes a frame, on which a pair of front wheel sets, a pair of middle wheel sets, a pair of rear wheel sets and a pair of elastic devices are provided.
- the frame has two pivot portions at opposite sides thereof.
- Each of the front wheel sets includes a front wheel mount having a first connection portion, which is pivoted to the pivot portion of the frame, and a second connection portion, and a front wheel connected to the second connection portion of the front wheel mount.
- Each of the middle wheel sets includes a middle wheel mount having a first connection portion, which is pivoted on the pivot portion of the frame, and a second connection portion, and a middle wheel connected to the second connection portion of the middle wheel mount.
- the elastic device are provided between the front wheel mounts and the middle wheel mounts respectively to cushion a swing of the front wheel set and the middle wheel set relative to the frame.
- FIG. 1 is a lateral view of a preferred embodiment of the present invention
- FIG. 2 is a perspective view of the front wheel mount, the middle wheel mount and the rear wheel mount of the preferred embodiment of the present invention
- FIG. 3 is an exploded view of FIG. 2 ;
- FIG. 4 is a sketch diagram of the preferred embodiment of the present invention, showing the power wheelchair running on a flat road;
- FIG. 5 is a sketch diagram of the preferred embodiment of the present invention in operation, showing the front wheel running on a rough road;
- FIG. 6 is a sketch diagram of the preferred embodiment of the present invention in operation, showing the middle wheel running on a rough road.
- a power wheelchair 100 of the preferred embodiment of the present invention includes a frame 10 , a pair of middle wheel sets 20 , a pair of front wheel sets 30 , a pair of rear wheel sets 40 and a pair of elastic devices 50 .
- the frame 10 has a front 10 a and a rear 10 b .
- the frame 10 has two pivot portions 11 at opposite sides of a bottom of the front 10 a .
- the pivot portions 11 are tubular members projected outwards.
- the frame 10 further has an upright support tube 12 behind the pivot portions 11 and a seat set 13 mounted on the support tube 12 .
- Each of the middle wheel sets 20 includes a middle wheel mount 21 and a middle wheel 22 pivoted on the middle wheel mount 21 .
- the middle wheel sets 20 are the driving wheel sets, each of which includes a frame base 23 and a transmission device 24 .
- the frame base 23 includes two parallel lateral plates 231 , a top plate 232 connected to the lateral plates 231 and a bottom plate 233 , each of which includes a hole 23 a .
- the frame base 23 has the hole 23 a on a bottom thereof to form a first hole portion, which constructs a first connection portion of the middle wheel mount 21 to be pivoted with the pivot portion 11 of the frame 10 that the frame base 23 may swing relative to the frame 10 .
- the outer lateral plate 231 has three fixing holes 23 b
- the top plate 233 has two axial holes 23 c , which construct a second hole portion on a top of the frame base 23 .
- the transmission device 24 has a motor 25 and a gear box 26 , which is fixed to the lateral plate 231 by bolts (not shown) through the fixing holes 23 b .
- the gear box 26 has a shaft 261 that form a second connection portion of the middle wheel mount 21 .
- the shaft 261 is connected to the middle wheel 22 to drive the middle wheel 22 running.
- the shaft 261 is behind the hole 23 a to make the middle wheel 22 , with the pivot portion 11 to be a center of swing, swing toward the front 10 a of the frame 10 .
- Each of the front wheel sets 30 includes a front wheel mount 31 and a front wheel 32 pivoted on the front wheel mount 31 .
- the front wheel mount 31 has a tube 33 to form a first connection portion and a wheel frame 34 extended from the tube 33 to the front of the frame 10 .
- a front of the wheel frame 34 forms a second connection portion of the front wheel mount 31 to be pivoted with the front wheel 32 .
- the tube 33 is between the lateral plates 231 to have the pivot portion 11 of the frame 10 through the holes 23 a of the lateral plates 231 and the tube 33 for pivot with the front wheel mount 31 that the front wheel sets may swing relative to the frame 10 .
- the wheel frame 34 has a lateral frame 35 at a middle thereof. The lateral frame 35 is projected inward, which has a third hole portion 36 .
- each of the rear wheel sets 40 is fixed to opposite sides of the rear 10 b of the frame 10 .
- the rear wheel sets 40 may be pivoted on the frame 10 also.
- Each of the elastic devices 50 includes a cushion member 51 and a compression spring 52 in the present invention.
- the cushion member 51 includes a cylinder 53 , a piston 54 and an adjusting member 55 .
- the cylinder 53 which includes an outer threaded section 531 , has an end pivoted on the second hole portion (i.e. the axial holes 23 c of the top plate 232 ) of the middle wheel mount 21 .
- the piston 54 has an end pivoted on the third hole portion 36 of the lateral frame 35 and the other end inserted into the cylinder 53 to be moved relative to the cylinder 53 .
- the adjusting member 55 is screwed onto the outer threaded section 531 of the cylinder 53 to be turned for movement forward and backward that the cylinder 53 urges an against portion of the compression spring 52 .
- the compression spring 52 has opposite ends urging the adjusting member 55 and the piston 54 to cushion a swing of the front wheel mount 31 and the middle wheel mount 21 relative to the frame 10 .
- the front wheel 32 touches the protrusion 101 first, and the middle wheel 22 drives the power wheelchair 100 keeping moving forward.
- the front wheel mount 31 of the front wheel set 30 is raised with the pivot portion 11 of the frame 10 being a fulcrum to drive the front wheel 32 climbing over the protrusion 101 , and, in the same time, raise the elastic device 50 that makes the piston 54 moving into the cylinder 53 and compressing the compression spring 52 to absorb the impact when the front wheel 32 hits the protrusion 101 and the return force of the compression spring 52 to stabilize the wheelchair 100 .
- the middle wheel mount 21 is moved downward by the elastic device 50 to press the middle wheel 22 and the front wheel 33 on the ground to stabilize the wheelchair 100 and make the middle wheel 22 keeping driving the wheelchair 100 forward.
- the middle wheel mount 21 is raised.
- the elastic device 50 absorbs the impact when the middle wheel 22 hits the protrusion and drives the front wheel set 30 moving downward to have the front wheel 32 pressing the ground to stabilize the wheelchair 100 .
- the compression spring 52 may be adjusted by turning the adjusting member 55 of the cushion member 51 to match different users and rounds that the power wheelchair 100 of the present invention can meet any condition.
- the present invention provides the front wheel mounts 31 and the middle wheel mounts 21 pivoted on the pivot portions 11 of the frame 10 respectively to fix the problem of the conventional wheelchair, which the front wheel mount and the driving wheel mount are fixed together as a rigid body.
- the present invention further provides the elastic devices 50 between the front wheel mounts 31 and the middle wheel mounts 21 respectively to replace the complex coupling device of the conventional wheelchair.
- the power wheelchair 100 of the present invention has advantages of simple structure, easy to design and manufacture, lower manufacture cost, easy to repair, and longer durability, furthermore, it can stably run on the rough roads.
- the elastic devices 50 do not directly contact or close to the seat set 13 so that the vibration is absorbed by the elastic devices 50 rather than transmits to the seat set 13 to make user sits on the seat set 13 more comfortable.
- the power wheelchair of the present invention may be designed to have the front wheels or the rear wheels to be the driving wheels rather than the middle wheels as described in the embodiment.
- the elastic devices may be provided between the middle wheel mounts and the rear wheel mounts also, and the elastic device may use other type of spring, such as torsion spring.
- the torsion spring may have opposite ends urging the front wheel mount and the middle wheel mount that the torsion spring may absorb the impact and connect the front wheel mount and the middle wheel mount, furthermore, it provides a simpler structure.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Handcart (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates generally to a wheelchair, and more particularly to a power wheel, which may drive on a rough road.
- 2. Description of the Related Art
- A conventional power wheelchair has a frame, on which two front wheels, two driving wheels and two rear wheels are provided on a front, middle and rear thereof respectively. The frame also is provided with two front wheel mounts and two driving wheel mounts on left and right sides to pivot the front wheels and the driving wheels thereon respectively. However, the front wheel mounts and the driving wheel mounts are rigid bodies and made in an integral with the frame, so that the wheelchair is hard to drive on a rough road. To overcome above problem, some had provided the front wheel mounts and the driving wheel mounts independently pivoted on the frame with a distance therebetween and two coupling assemblies connecting the front wheel mounts and the driving wheel mounts respectively. The front wheel mounts and the driving wheel mounts may be moved relatively to the frame independently and the coupling assemblies provide connections between the front wheel mounts and the driving wheel mounts to make the front wheels and the driving wheels keep in touch on the ground to stabilize the wheelchair. In addition, there are cushion devices between the front and driving wheel mounts and the frame to absorb vibration that make user sit on the wheelchair more comfortable.
- However, the coupling assemblies, which connect the front wheel mounts and the driving wheel mounts to keep them in touch on the ground, usually are very complex. Typically, the coupling assembly is a multi-linkage mechanism including a plurality of links with various lengths. This kind of multi-linkage mechanism is hard to design and assemble and has a high cost. Furthermore, stress always concentrates at pivots between the links that means the coupling assembly cannot work for a long time. Again, the cushion devices are adjacent to a seat of the wheelchair that vibration transmits to the seat through the cushion devices. As a result, the user is not comfortable to sit on the wheelchair and the cushion capacity of the wheelchair is limited also.
- The primary objective of the present invention is to provide a power wheelchair, which provides the front wheel mount and the middle wheel mount pivoted on the same position of the frame to replace the conventional structure, which the front wheel mount, and driving wheel mount and the frame are a rigid body. Furthermore, the power wheelchair of the present invention provides an elastic device between the front wheel mount and the middle wheel mount for vibration absorption. The power wheelchair of the present invention has advantages of simple structure, easy to design and manufacture, lower manufacture cost, easy to repair, and longer durability.
- According to the objective of the present invention, a power wheelchair includes a frame, on which a pair of front wheel sets, a pair of middle wheel sets, a pair of rear wheel sets and a pair of elastic devices are provided. The frame has two pivot portions at opposite sides thereof. Each of the front wheel sets includes a front wheel mount having a first connection portion, which is pivoted to the pivot portion of the frame, and a second connection portion, and a front wheel connected to the second connection portion of the front wheel mount. Each of the middle wheel sets includes a middle wheel mount having a first connection portion, which is pivoted on the pivot portion of the frame, and a second connection portion, and a middle wheel connected to the second connection portion of the middle wheel mount. The elastic device are provided between the front wheel mounts and the middle wheel mounts respectively to cushion a swing of the front wheel set and the middle wheel set relative to the frame.
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FIG. 1 is a lateral view of a preferred embodiment of the present invention; -
FIG. 2 is a perspective view of the front wheel mount, the middle wheel mount and the rear wheel mount of the preferred embodiment of the present invention; -
FIG. 3 is an exploded view ofFIG. 2 ; -
FIG. 4 is a sketch diagram of the preferred embodiment of the present invention, showing the power wheelchair running on a flat road; -
FIG. 5 is a sketch diagram of the preferred embodiment of the present invention in operation, showing the front wheel running on a rough road; and -
FIG. 6 is a sketch diagram of the preferred embodiment of the present invention in operation, showing the middle wheel running on a rough road. - As shown in
FIG. 1 toFIG. 6 , apower wheelchair 100 of the preferred embodiment of the present invention includes aframe 10, a pair ofmiddle wheel sets 20, a pair offront wheel sets 30, a pair ofrear wheel sets 40 and a pair ofelastic devices 50. - The
frame 10 has afront 10 a and a rear 10 b. In the present invention, theframe 10 has twopivot portions 11 at opposite sides of a bottom of thefront 10 a. Thepivot portions 11 are tubular members projected outwards. Theframe 10 further has anupright support tube 12 behind thepivot portions 11 and a seat set 13 mounted on thesupport tube 12. - Each of the
middle wheel sets 20 includes amiddle wheel mount 21 and amiddle wheel 22 pivoted on themiddle wheel mount 21. In the present invention, themiddle wheel sets 20 are the driving wheel sets, each of which includes aframe base 23 and atransmission device 24. - As shown in
FIG. 3 , theframe base 23 includes two parallellateral plates 231, atop plate 232 connected to thelateral plates 231 and abottom plate 233, each of which includes ahole 23 a. In the present invention, theframe base 23 has thehole 23 a on a bottom thereof to form a first hole portion, which constructs a first connection portion of themiddle wheel mount 21 to be pivoted with thepivot portion 11 of theframe 10 that theframe base 23 may swing relative to theframe 10. The outerlateral plate 231 has threefixing holes 23 b, and thetop plate 233 has twoaxial holes 23 c, which construct a second hole portion on a top of theframe base 23. - The
transmission device 24 has amotor 25 and agear box 26, which is fixed to thelateral plate 231 by bolts (not shown) through thefixing holes 23 b. Thegear box 26 has ashaft 261 that form a second connection portion of themiddle wheel mount 21. Theshaft 261 is connected to themiddle wheel 22 to drive themiddle wheel 22 running. Theshaft 261 is behind thehole 23 a to make themiddle wheel 22, with thepivot portion 11 to be a center of swing, swing toward thefront 10 a of theframe 10. - Each of the
front wheel sets 30 includes afront wheel mount 31 and afront wheel 32 pivoted on thefront wheel mount 31. Thefront wheel mount 31 has atube 33 to form a first connection portion and awheel frame 34 extended from thetube 33 to the front of theframe 10. A front of thewheel frame 34 forms a second connection portion of thefront wheel mount 31 to be pivoted with thefront wheel 32. In assembly, thetube 33 is between thelateral plates 231 to have thepivot portion 11 of theframe 10 through theholes 23 a of thelateral plates 231 and thetube 33 for pivot with thefront wheel mount 31 that the front wheel sets may swing relative to theframe 10. Thewheel frame 34 has alateral frame 35 at a middle thereof. Thelateral frame 35 is projected inward, which has athird hole portion 36. - In the present invention, each of the
rear wheel sets 40 is fixed to opposite sides of the rear 10 b of theframe 10. Of course, therear wheel sets 40 may be pivoted on theframe 10 also. - Each of the
elastic devices 50 includes acushion member 51 and acompression spring 52 in the present invention. Thecushion member 51 includes acylinder 53, apiston 54 and an adjustingmember 55. Thecylinder 53, which includes an outer threadedsection 531, has an end pivoted on the second hole portion (i.e. theaxial holes 23 c of the top plate 232) of themiddle wheel mount 21. Thepiston 54 has an end pivoted on thethird hole portion 36 of thelateral frame 35 and the other end inserted into thecylinder 53 to be moved relative to thecylinder 53. The adjustingmember 55 is screwed onto the outer threadedsection 531 of thecylinder 53 to be turned for movement forward and backward that thecylinder 53 urges an against portion of thecompression spring 52. Thecompression spring 52 has opposite ends urging the adjustingmember 55 and thepiston 54 to cushion a swing of thefront wheel mount 31 and themiddle wheel mount 21 relative to theframe 10. - Above is the structure of the
power wheelchair 100 of the present invention. The action of thepower wheelchair 100 is described hereunder. - As shown in
FIG. 5 andFIG. 6 , when thepower wheelchair 100 runs on a rough road (it shows aprotrusion 101 in the drawings), thefront wheel 32 touches theprotrusion 101 first, and themiddle wheel 22 drives thepower wheelchair 100 keeping moving forward. The front wheel mount 31 of the front wheel set 30 is raised with thepivot portion 11 of theframe 10 being a fulcrum to drive thefront wheel 32 climbing over theprotrusion 101, and, in the same time, raise theelastic device 50 that makes thepiston 54 moving into thecylinder 53 and compressing thecompression spring 52 to absorb the impact when thefront wheel 32 hits theprotrusion 101 and the return force of thecompression spring 52 to stabilize thewheelchair 100. In addition, themiddle wheel mount 21 is moved downward by theelastic device 50 to press themiddle wheel 22 and thefront wheel 33 on the ground to stabilize thewheelchair 100 and make themiddle wheel 22 keeping driving thewheelchair 100 forward. When thefront wheel 32 has crossed theprotrusion 101 and themiddle wheel 22 touches theprotrusion 101, as shown inFIG. 6 , themiddle wheel mount 21 is raised. In the same time, theelastic device 50 absorbs the impact when themiddle wheel 22 hits the protrusion and drives the front wheel set 30 moving downward to have thefront wheel 32 pressing the ground to stabilize thewheelchair 100. - In addition, the
compression spring 52 may be adjusted by turning the adjustingmember 55 of thecushion member 51 to match different users and rounds that thepower wheelchair 100 of the present invention can meet any condition. - In conclusion, the present invention provides the front wheel mounts 31 and the middle wheel mounts 21 pivoted on the
pivot portions 11 of theframe 10 respectively to fix the problem of the conventional wheelchair, which the front wheel mount and the driving wheel mount are fixed together as a rigid body. The present invention further provides theelastic devices 50 between the front wheel mounts 31 and the middle wheel mounts 21 respectively to replace the complex coupling device of the conventional wheelchair. Thepower wheelchair 100 of the present invention has advantages of simple structure, easy to design and manufacture, lower manufacture cost, easy to repair, and longer durability, furthermore, it can stably run on the rough roads. Theelastic devices 50 do not directly contact or close to the seat set 13 so that the vibration is absorbed by theelastic devices 50 rather than transmits to the seat set 13 to make user sits on the seat set 13 more comfortable. - The power wheelchair of the present invention may be designed to have the front wheels or the rear wheels to be the driving wheels rather than the middle wheels as described in the embodiment. The elastic devices may be provided between the middle wheel mounts and the rear wheel mounts also, and the elastic device may use other type of spring, such as torsion spring. The torsion spring may have opposite ends urging the front wheel mount and the middle wheel mount that the torsion spring may absorb the impact and connect the front wheel mount and the middle wheel mount, furthermore, it provides a simpler structure.
- The description above is a few preferred embodiments of the present invention and the equivalence of the present invention is still in the scope of the claim of the present invention.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/739,809 US7775307B2 (en) | 2007-04-25 | 2007-04-25 | Power wheelchair |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US11/739,809 US7775307B2 (en) | 2007-04-25 | 2007-04-25 | Power wheelchair |
Publications (2)
Publication Number | Publication Date |
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US20080264702A1 true US20080264702A1 (en) | 2008-10-30 |
US7775307B2 US7775307B2 (en) | 2010-08-17 |
Family
ID=39885658
Family Applications (1)
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US11/739,809 Active 2029-02-13 US7775307B2 (en) | 2007-04-25 | 2007-04-25 | Power wheelchair |
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US (1) | US7775307B2 (en) |
Cited By (8)
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US20080066974A1 (en) * | 2006-09-14 | 2008-03-20 | Pearlman Jonathan L | Personal vehicle |
US20110012316A1 (en) * | 2009-07-14 | 2011-01-20 | Merits Health Products Co. Ltd. | Wheel set structure of an electric wheelchair |
US8210556B2 (en) | 2005-08-18 | 2012-07-03 | Sunrise Medical Hhg, Inc. | Midwheel drive wheelchair with independent front and rear suspension |
US8851214B2 (en) | 2010-07-15 | 2014-10-07 | Permobil Ab | Electric mid-wheel drive wheelchair |
WO2018054694A1 (en) | 2016-09-23 | 2018-03-29 | Otto Bock Mobility Solution Gmbh | Wheelchair |
US20220302865A1 (en) * | 2014-08-01 | 2022-09-22 | Falcon Power, LLC | Variable torque motor/generator/transmission |
US11888421B2 (en) | 2014-08-01 | 2024-01-30 | Falcon Power, LLC | Variable torque motor/generator/transmission |
WO2024108136A1 (en) * | 2022-11-17 | 2024-05-23 | Sunrise Medical (Us) Llc | Wheelchair powertrain, suspension, and control system |
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US6554086B1 (en) | 2000-10-27 | 2003-04-29 | Invacare Corporation | Obstacle traversing wheelchair |
US7040429B2 (en) | 2001-10-10 | 2006-05-09 | Invacare Corporation | Wheelchair suspension |
US7293801B2 (en) | 2003-08-18 | 2007-11-13 | Invacare Corporation | Self-stabilizing suspension for wheeled vehicles |
US11213441B2 (en) | 2002-10-25 | 2022-01-04 | Invacare Corporation | Suspension for wheeled vehicles |
US8113531B2 (en) * | 2006-08-16 | 2012-02-14 | Sunrise Medical Hhg, Inc. | Personal mobility vehicle having a pivoting suspension with a torque activated release mechanism |
CN102499827B (en) | 2007-02-08 | 2015-11-25 | 英瓦卡尔公司 | Wheelchair suspension |
WO2008100759A2 (en) | 2007-02-14 | 2008-08-21 | Invacare Corporation | Stability control system |
CH713464B1 (en) * | 2007-08-24 | 2018-08-15 | Levo Ag Wohlen | Vehicle with center-wheel drive, in particular wheelchair or upright wheelchair. |
EP3238682A3 (en) | 2009-10-09 | 2018-01-10 | Invacare Corporation | Wheelchair suspension with opposite movement of anti-tip arms |
AU2013221283B2 (en) | 2012-02-15 | 2017-05-25 | Invacare Corporation | Wheelchair suspension |
US9732557B2 (en) * | 2013-10-15 | 2017-08-15 | James Landers | Removable ladder wheels |
US11001117B2 (en) * | 2018-03-23 | 2021-05-11 | Amazon Technologies, Inc. | Mobile drive unit having a split chassis |
US11903887B2 (en) | 2020-02-25 | 2024-02-20 | Invacare Corporation | Wheelchair and suspension systems |
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US11888421B2 (en) | 2014-08-01 | 2024-01-30 | Falcon Power, LLC | Variable torque motor/generator/transmission |
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US11382808B2 (en) | 2016-09-23 | 2022-07-12 | Otto Bock Mobility Solutions Gmbh | Wheelchair |
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